'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')

// 用以支持 gzip 压缩
const CompressionWebpackPlugin = require('compression-webpack-plugin')
const productionGzipExtensions = ['js', 'css']

function resolve(dir) {
  return path.join(__dirname, dir)
}

// page title
const name = defaultSettings.title || 'KIM HOME'

// dev port
const port = process.env.port || process.env.npm_config_port || 8088

const IS_PROD = ['production'].includes(process.env.NODE_ENV)

const baseApi = process.env.VUE_APP_BASE_API

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  // 根域上下文目录
  publicPath: '/',
  // 构建输出目录
  outputDir: 'dist',
  // 静态资源目录 (js, css, img, fonts)
  assetsDir: 'static',
  //	lintOnSave: process.env.NODE_ENV === 'development',
  // 是否开启eslint保存检测，有效值：ture | false | 'error'
  lintOnSave: false,
  // 是否在构建生产包时生成 sourceMap 文件，false将提高构建速度
  productionSourceMap: false,
  css: {
    // 是否使用css分离插件 ExtractTextPlugin
    extract: IS_PROD,
    // 开启 CSS source maps
    sourceMap: false,
    // css预设器配置项
    loaderOptions: {},
    // 启用 CSS modules for all css / pre-processor files.
    modules: false,
  },
  devServer: {
    port: port,
    // 告诉dev-server在服务器启动后打开浏览器。将其设置true为打开默认浏览器
    open: false,
    // 出现编译器错误或警告时，在浏览器中显示全屏覆盖。
    overlay: {
      warnings: false,
      errors: true
    },
    // 热部署
    hot: true,
    // 配置跨域 (后台网关如果配置了跨域设置,那么该proxy隐藏即可)
    proxy: {
      '/api/auth': {
        target: baseApi,
        changOrigin: true, // 允许跨域请求
        pathRewrite: {
          // 重写路径，替换请求地址中的指定路径
          // 将请求地址中的/api替换为空，也就是请求地址中不会包含/api/
          '^/api/auth': ''
        }
      },
      '/api': {
        target: baseApi,
        changOrigin: true,
        pathRewrite: {
          '^/api': ''
        }
      }
    }
  },
  // 该配置会合并进 `webpack` 配置中
  // 比如下列的 `name` 属性会覆盖 `webpackConfig.name` 属性的值
  // 此时 `index.html` 中的 `<%= webpackConfig.name %>` 会被覆盖
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    },
    plugins: [
      new CompressionWebpackPlugin({
        filename: '[path].gz[query]',
        algorithm: 'gzip',
        test: new RegExp('\\.(' + productionGzipExtensions.join('|') + ')$'),
        threshold: 10240,
        minRatio: 0.8
      })
    ]
  },
  chainWebpack(config) {
    config.plugins.delete('preload') // TODO: need test
    config.plugins.delete('prefetch') // TODO: need test

    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/assets/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/assets/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    // set preserveWhitespace
    config.module
      .rule('vue')
      .use('vue-loader')
      .loader('vue-loader')
      .tap(options => {
        options.compilerOptions.preserveWhitespace = true
        return options
      })
      .end()

    config
      // https://webpack.js.org/configuration/devtool/#development
      .when(process.env.NODE_ENV === 'development',
        config => config.devtool('cheap-source-map')
      )

    config
      .when(process.env.NODE_ENV !== 'development',
        config => {
          config
            .plugin('ScriptExtHtmlWebpackPlugin')
            .after('html')
            .use('script-ext-html-webpack-plugin', [{
              // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }])
            .end()
          config
            .optimization.splitChunks({
              chunks: 'all',
              cacheGroups: {
                libs: {
                  name: 'chunk-libs',
                  test: /[\\/]node_modules[\\/]/,
                  priority: 10,
                  chunks: 'initial' // only package third parties that are initially dependent
                },
                elementUI: {
                  name: 'chunk-elementUI', // split elementUI into a single package
                  priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                  test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
                },
                commons: {
                  name: 'chunk-commons',
                  test: resolve('src/components'), // can customize your rules
                  minChunks: 3, //  minimum common number
                  priority: 5,
                  reuseExistingChunk: true
                }
              }
            })
          config.optimization.runtimeChunk('single')
        }
      )
  }
}
